[其他] 排列組合
How many bit strings contain exactly eight 0s and 10 1s if every 0 must
be immediately followed by 1?
我的想法是把1和0綁再一起做排列10!/8!2!=45
然後綁的方式有10和01
所以45*2=90
可是答案是45
請問我錯在哪
謝謝
是不是我誤解follow的意思阿
我查google好像都只寫01
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 114.41.122.121
※ 編輯: yuchiao0921 來自: 114.41.122.121 (06/17 19:56)
→
06/17 19:59, , 1F
06/17 19:59, 1F
※ 編輯: yuchiao0921 來自: 114.41.122.121 (06/17 20:03)
推
06/17 20:03, , 2F
06/17 20:03, 2F
→
06/17 20:03, , 3F
06/17 20:03, 3F
→
06/17 20:04, , 4F
06/17 20:04, 4F
→
06/17 20:04, , 5F
06/17 20:04, 5F
→
06/17 20:04, , 6F
06/17 20:04, 6F
推
06/17 20:06, , 7F
06/17 20:06, 7F
→
06/17 20:08, , 8F
06/17 20:08, 8F
討論串 (同標題文章)